Dear sir, how much testosterone is enough for free testosterone?

Look at total T: Free testosterone results are often difficult to interpret as normal ranges are different in each lab. They are sometimes helpful for women but for boys and men it is better to look at the total testosterone test. The normal range for an adult is 250-800 ng/dL and a level below 200 may be significant IF it is accompanied by symptoms of low T (loss of libido, lack of energy